Abstract:
A measurement device is for use with a current-type sensor unit, which, when applied with a driving voltage, is capable of reacting with a target substance for generating a sensor current that corresponds to a concentration level of the target substance, and includes: a driving unit operable to generate the driving voltage that includes alternating current (AC) and direct current (DC) components; and a processing unit for receiving the sensor current from the current-type sensor unit, and operable to determine the concentration level of the target substance according to a peak-to-peak value of the sensor current received by the processing unit.
Abstract:
A measurement device is for use with a current-type sensor unit, which, when applied with a driving voltage, is capable of reacting with a target substance for generating a sensor current that corresponds to a concentration level of the target substance, and includes: a driving unit operable to generate the driving voltage that includes alternating current (AC) and direct current (DC) components; and a processing unit for receiving the sensor current from the current-type sensor unit, and operable to determine the concentration level of the target substance according to a peak-to-peak value of the sensor current received by the processing unit.
Abstract:
An ion sensing circuit includes an ion sensing element configured for exposure to an electrolytic solution and control of a sensing current through the ion sensing element according to an ion concentration of the electrolytic solution. The ion sensing circuit further includes a current-to-voltage converter coupled electrically to the ion sensing element for generating a converted voltage from the sensing current. The ion sensing circuit also includes a comparator coupled electrically to the current-to-voltage converter for comparing the converted voltage and a threshold voltage to form a comparison result. In addition, the ion sensing circuit includes a latch coupled electrically to the comparator and the current-to-voltage converter. The latch is configured for sampling the output of the comparator according to a clock signal to generate a digital signal used by the current-to-voltage converter for converting the sensing current to the converted voltage.
Abstract:
An impedance analyzer includes: a control voltage generating unit for generating a control voltage that has a predetermined amplitude value; a measuring unit operable to provide an output current, which has an amplitude value corresponding to that of the control voltage, for flowing through first and second body portions of a biological target, and to generate a measurement voltage that has an amplitude value corresponding to a difference between voltages at the first and second body portions attributed to flow of the output current therethrough; and a calculating module operable to determine an electrical impedance between the first and second body portions according to a predetermined adjustment value and the amplitude value of the measurement voltage.
Abstract:
A system for bioimpedance analysis of a biological tissue includes a tissue inspector and an impedance calculator. The tissue inspector includes an inspecting circuit for receiving a test signal, a plurality of electrode sets respectively corresponding with a plurality of test parts, and a multiplexer operable to couple a selected electrode set at a detected test part to the inspecting circuit to detect a signal response resulting from the test signal. The impedance calculator is operable to compute impedance information corresponding to the detected test part based on the test signal and the detected signal response.
Abstract:
An impedance analyzer includes: a control voltage generating unit for generating a control voltage that has a predetermined amplitude value; a measuring unit operable to provide an output current, which has an amplitude value corresponding to that of the control voltage, for flowing through first and second body portions of a biological target, and to generate a measurement voltage that has an amplitude value corresponding to a difference between voltages at the first and second body portions attributed to flow of the output current therethrough; and a calculating module operable to determine an electrical impedance between the first and second body portions according to a predetermined adjustment value and the amplitude value of the measurement voltage.
Abstract:
An ion sensing circuit includes an ion sensing element configured for exposure to an electrolytic solution and control of a sensing current through the ion sensing element according to an ion concentration of the electrolytic solution. The ion sensing circuit further includes a current-to-voltage converter coupled electrically to the ion sensing element for generating a converted voltage from the sensing current. The ion sensing circuit also includes a comparator coupled electrically to the current-to-voltage converter for comparing the converted voltage and a threshold voltage to form a comparison result. In addition, the ion sensing circuit includes a latch coupled electrically to the comparator and the current-to-voltage converter. The latch is configured for sampling the output of the comparator according to a clock signal to generate a digital signal used by the current-to-voltage converter for converting the sensing current to the converted voltage.
Abstract:
An electrochemical sensor for detecting the concentration of ions in a solution includes a substrate, a sensor unit, and a reference electrode. The sensor unit includes at least one working electrode. The working electrode has a conductive layered structure formed on the substrate, and a sensor element of a metal oxide film formed on the conductive layered structure and capable of reacting with the ions in the solution to generate a potential. The reference electrode is spaced apart from the working electrode, and includes a conductive film printed on the substrate for establishing a potential difference between the working electrode and the reference electrode when the electrochemical sensor is brought into contact with the solution.